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The measurements were made by means of a bomb calorimeter, which was calibrated electrically for some of the measurements, and by burning standard sample benzoic acid for the remainder. The samples of liquid were inclosed in thin-walled glass bulbs which were flattened on opposite sides, and were ignited by an electric fuse of iron wire. No combustible material other than the iron wire was required to ignite the liquids. Combustible impurities and carbon dioxide were removed from the oxygen before admitting it to the bomb. Measurements of carbon dioxide and carbon monoxide formed in the combustion indicated that the liquids contained very little inert impurity, and that combustion was very nearly complete. The Washburn correction was applied to the results of the calorimetric measurements. The empirical equation tlFi250 c= 259.28 + 648.84n+ 0.2587n2, where -tlFi250C is the heat of combustion in international kilojoules per mole of liquid normal Cn Fi2n+2 in gaseous oxygen at 25° C and under a constant pressure of 1 atmosphere, the products of combustion being gaseous carbon dioxide and liquid water, also at 25° C, reproduces the mean values within 0.02 percent. The final experimental values are estimated to be accurate within 0.03 or 0.04 percent. CONTENTS Page

Heats of combustion of the liquid normal parafin hydrocarbons from hexane to dodecane